I'm a "beginner", I started playing the game during the pandemic, so no previous experience before 5e. I've read the DMG14 cover to cover, it helped a lot but still needed to search online info to "connect the dots". Having DMG24 would have been really useful to start (I don't think the boxed set are really helpful here, too).
Then I found some really good 3rd party books that really helped me to "start anew" as DM. The Alexandrian "So you want to be a Gamemaster" is what a DM introductionary book should be (and a little more) and SlyFourish Lazy series is a collection of more tools and advice to start DMing in a serious manner. Only then, a lot of DMG14 clicked, with a lot of information on how to customize or create world, adventures, dungeon. It seemed like I got the book in the inverse order to truly dtart DMing.
I really wish that lot of DMG14 goodness will be published again as a "Toolbox" book, WotC can not let those tables and tools to be lost or not legally available. I don't think those will be in the Forgotten Realms Campaign Book, because the idea of using that book is not to create things.
It was teased (and if following the bi-annual core expansion books cycle that was in 5e 2014 era) that a Xanathar/Tasha combo book will be released with updates of what was cut out from the both books, updating subclasses. A lot of Xanathar's DM advice has been integrated, and a lot of player's content of Tasha has been integrated too. Make a more big book, add some advanced making tools and you have a sure seller with both player's and dm's content, while waiting old book stock ends.
Also... still only 4 pages for traps? Why are always so stingy about them?